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Gorgenghasts are large, ancient sea-dragons mentioned in How to Ride a Dragon's Storm.
- "It was difficult to tell because it was so dark, but it wasn't a species I recognized. It reminds me of some of the ones that I've heard about in the ancient Sagas. A Leviathorgan, or a Gorgenghast."
Gorgenghasts, like Leviathorgans, have been around since the age of the Dinosaurs. There is no mention of what a Gorgenghast looks like, but we can surmise that they are extremely large and intimidating.